1. I. Stark and M. Stordeur, Proc. the 18th ICT (1999), pp. 465–472.
2. J. Weber, K. Potje-Kamloth, F. Hasse, P. Detemple, F. Völklein, and T. Doll, Sens. Actuators A 132, 325 (2006).
3. N. Kockmann, T. Heusgen, and P. Woias, Proc. Transducer ‘07 (2007), pp. 133–136.
4. Y. van Andel, M. Jambunathan, R.J.M. Vullers, and V. Leonov, Proc. the 35th MNE (2009), pp. 1294–1296.
5. V. Leonov, R. Vullers, M. Goedbloed, and Y. van Andel, Proc. the 6th ECT, O-17 (2008).